It sounds like normal bunny puberty. It can be like that, like the flipping of a switch. One day a cuddly baby, the next a total diva who wants nothing to do with you and who aggressively defends her space. The pee-and-poop-marking is also very typical. It doesn’t matter how well you litter-train a baby rabbit, when puberty hits, the urge to mark territory becomes irresistible. It’s not by choice, it’s an instinct.
So what you should do now, I think, is see about having her spayed. Girl rabbits should be spayed for health-reasons alone, but it will also take care of the not-so-charming hormone-driven behaviors you’re seeing now.
It’s natural for bunnies to binky/run around less and sleep more during the day and, ideally, to eat less as they mature. But she shouldn’t be lethargic and she shouldn’t stop eating, if she does, there’s sth wrong. But as long as she eats, drinks, poops and pees and doesn’t sit hunched up or hide herself away in weird places, this sounds perfectly consistent with bunny puberty.